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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fbb8973f9ac409897752b0c0e86468718205e869b018c687ede53840b43016f' 
  AND token = 'y8mQY6f1WM6UzYRJ4JFDjkbQ3cxnxSiNNcCO4n+f1pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}